Arbor



Fatented Aug. 5, 1930 UNITED STATES HAROLD W. LANGBEN, OF LOS ANGELES, (AII'IEOIRNIAV Anson Application area November 5, 192s. serial No. 317,295'.

My invention relates to arbors and the like for supporting aA part to be Worked on, and it consists of a self-centralizing arbor in Which the device to be supported will be concentrically supported by the arbor, When the device is attached to the arbor.

One of the important uses of my invention is for supporting automobile Wheels for truing the brake-drums thereof. This is or- 10 dinarily accomplished on a drum-lathe Which includes an arbor which supports the Wheel. The arbor is usually carried by a spindle which is driven by a suitable motor. The Wheel is concentrically secured on the arbor, and is rotated. The drum-lathe is provided with a carriage Which supports a cutting tool, Which cutting tool is adapted to Work on the surface of the brake-drum, and to make it vconcentric with the center of rotation of the Wheel.

The openings in the hubs of the different Wheels are of different sizes and tapers, and in the ordinary form of drum-lathe it is necessary to have a number of different arbors or a number of different sleeves so that these different Wheels may be accommodated.

One of the objectsof this invention is the provision of an arbor Which is susceptible of supporting various devices having different sizes. of openings, or openings With different tapers.

A. further object of the invention is the provision of an arbor having a pair. of centralizing-members Which are readily adjusted relative to the device to be supported, so that the device Will be concentrically supported. The centralizing-means are designed so that they may be made to concentrically support devices having different sizes and tapers Aor openings.

A further object of the invention resides in the provision of a self-centering arbor which includes a primary centralizing device and a secondary centralizing device. The

primary-means is provided for moving the device into engagement with the primaryl centralizing-member and the secondarymeans is provided for moving the secondary centraliZing-member into engagement with the device.

A further object of the invention is to provide a self-centering arbor in Which the. primary centraliZing-member is adapted to rest in the opening of the device, and in Which the secondary centraliZing-member engages the device at one end of the central opening thereof. f 'zv A further object of the invention is to `pro-v vide a self-centering arbor in which one of the centralizing-members is provided ,With4 a frusto-conical face adapted to engage the device at one end of the central opening thereof.

1t is a .still further object of the invention to provide a device of the character mentioned in which the primary and secondaryy means are provided in the form of nuts threadedly advanced on the arbor.

The arbor of the invention is adapted to be carried by a spindle. The spindle has an opening formed through it, one end of Which is tapered, and the arbor has a tapered-,end fitting' into the tapered part of the spindle.

It is an object of this invention to provide a means for separating the arbor and the spindle, which consists of a nut or equivalent part screwed on to the arbor, and adapted for advancement toward the spindle so that the end of the spindle may be engagedand the arbor thus forced'from the spindle.`

A further object ofthe invention resides in the provision of an arbor and spindle combination as specified above, in Which the tvvo parts are screwed together by means of a bolt extending` through the end of the spindle and threadedly engaging the arbor, the bolt also engaging one end of the spindle, thus holding said arbor to said spindle.

Other objects Will be pointed out in the following description. .f

The invention may be best understood by n reference to the accompanying drawings, in

Referring to the drawing in detail, thev numeral 11 represents a supporting strueture which includes bearings 12 and 13 Which support a rotatable spindle 14. rlhe spindle 14 has a Worm gear 15 secured to it, which Worm gear is adapted'to be rotated by a Worm 16. The spindle 14 has an opening 18 formed through it, and the left end of the opening is-frusto-conical, as shown at 19.

Supported bythe spindle 14 is an arbor 20. The riglit'end of the arbor 20 is frustoconical as indicated at 21, and is adapted to be received in the frusto-conical part 19 of the spindle 14. The right end vof the arbor 20 is provided With a threaded cavity 22 into which the left end of a bolt 23 is threaded. The bolt 23 extends outward from the right lend of the opening 18, and has a head formed on'the right end thereof, which head is adapted to engage the right end of the spindle 14. By screwing the bolt 23 into the cavity Y22 the arbor 20 is securedto the spindle 14.

The partV of the arbor extending from the spindle 14 is provided With a central cylindrical portion 28 and a reduced end 29. Be-

tween the portion 28 and the end 29gis an annular shoulder 30. Adapted to be placed on the reduced end 29 in engagement with the shoulder '30 is a primary centralizingmember 31. The primary centralizingmember 31 preferably has an external cylindrical face 32 and a cylindrical opening 33 through which the reduced end 29'is eX- o thereduced kend 29.

-"eneL--at VVsi` i i" t d d Ad pted to lde on the ceitial portion 28 is a secondary centralizing-niember 34. The secondar f centraliZinU-member 34 has a frusto-conieal face 35 which is d1- rected toward the primary centralizingmember 31. A cylindrical opening 39 is ormec irouO' ie secondar f' cen ianzino'- member 34, through which the'central part 28 of the arbor 2O extends. p .Placed on the reduced end 29 of the arbor 20 is the primary-means of the invention, "which consists of a Washer 33V and a primary nut 39 which is threaded on primary ythreads 40, which primary threads 40 are formedl on 1t should be noted that the primary threads 49 are left hand threads.

That portion ofthe arbor 2O adjacent to thep'right Vend of theV central portion 28 is provided with secondary threads 42 vwhich are right hand threads.V Jadapted to be i carried by this portion ofthe arbor 29 is a secondary-means .in the form of asecondary nut 43, which is threaded onto'the secondary1 threads 42. o The left end-face 44 of the secondary nut 43 is adapted to engagethe right end-face 45 of the secondary centralizingmember 34. The right part of tlie'secondary nut 43 is provided with an annular lip 4'? so that the spindle 14 may be engaged when the secondary nut 43 is advanced to lthe right. The self-centering' arbor ot the invention is designed so that it may coiicentrically support devices such as automobile Wheels which have different sized openings, or openings of different degrees of taper. ln the drawing the numeral represents an automobile Wheel having a brake-drum 51 which it is desired to turn down on the drum-lathe illustrated, for the purpose of truing it. rlhe Wheel 59 has a hub ,51a provided with a concentric frusto-conical opening` 52. rlhe man nerof supporting the Wheel 50 on the arbor 2O will nonT be described.

All of the parts of the arbor are assembled With the exception of the Washer 33 and the primary nut 39. rlhe Wheel 50 is placed on the arbor substantially as shown in Figs. 1 and 2. The Washer 33 and the'nut 39 are then pla-ced on the reducedend 29, and the nut 39 i is ladvanced to the right until the Wall of the frusto-conical opening 52 is brought into enf' gagement with the left edge of the cylindrical face 32 of the primary centralizing-member 31. 1lWhen this occurs the left part of the hub 51a is retained concentric to the arbor 20. At

this time the secondary nut 43 vis resting'in a' positionindicated by dotted lines 53, and the secondary centraliZing-meinber 34 is resting ina position indicated by dotted lines 54. As shown in Fig. 2, at this time only the left part of the hub 512L is centralized, and theV right part thereof is not.

The next step in the attachment of the Wheel 50 to the arbor 20 is to advance the see- 'oiidary' nut 43 from the position indicated by dotted lines 53, into the full lineposition of-V- Fig. 2. This causes the secondary centralizing-member 34 to slide to the left of the central portion 2 3 ofthe arbor 20, and to engage the Aright part of the liub 51a at the endof the frusto-conical opening 52. rlhis engagement of these parts causes the right part of theV hub 51 to be moved into concentric relation With the arbor 20". rlhe Wheel 50-is nov.T secured to the arbor 2O and the drum-lathe is noiv set into operation in order that the bralre-drum-l may, be Worked upon. primary threads in the form of left hand By providing the par threads, and the secondary 'threads in the Y form of right hand threads, the pressure of lthe cuttingtool against the brake-drum 51 ar j centraliZing-member 34 toward Vthe Wheel 50 .in orderto cause thezsecon'dary centralizf ing-member 34 to engage the `Wheel at uthe end ofthe .truste-conical opening 52. f

The invention is designed so that various devices having diii'erent sizes and different tapers of openings may be accommodated. For example, if the lett end of the frustoconical opening 52 Were smaller, the primary centralizing-member 81 would engage the Wall of the truste-conical opening 52 nearer to the vertical center of the Wheel 50. It the lett end ot the opening 52 Were larger, the primary centraliZing-member 31 would engage it nearer the left end thereof. It the right end of the trusto-conical opening 52 were smaller it would engage a smaller part of the rusto-conical face 35 ot the centralizing-member 341, and if the right end of the truste-conical opening 52 Were larger it Would engage a larger part of the trustoconical face 35.

rIhe primary and secondary centralizingmembers will concentrically support devices having different sizes of openings, and openings ot dierent tapers. In addition to this the parts are designed so that larger or smaller centraliZing-members may be readily substituted for those shown in the drawing.

`When it is desired to remove the arbor 2O troni the spindle 14, the bolt 23 is unscrevved and the secondary nut 43 is advanced to the right. This causes the lip 117 to engage the spindle 14, and causes 'the arbor 20 to be moved to the left relative to the spindle 14.

I claim as my invention:

1. ln a self-centering arbor ot the class described, tlie combination of: an arbor; a primary centraliZing-member engaging a shoulder on said arbor, adapted to engage the device to be supported; primary-means for engaging and moving the device into engagement With said primary centraliZing-member; a secondary centraliZing-member carried by said arbor, and adapted to engage the device; and secondary-means for moving said secondary centraliZing-member into engagement with the device.

2. ln a self-centering arbor of the class described, the combination ot: an arbor, a primary centralizing-member engaging a shoulder on said arbor, adapted to engage the interior ot the device to be supported; primarymeans for engaging and moving the device into engagement with said primary centralizing-member; a secondary centraliZing-member carried by said arbor, and adapted to engage the device; and secondary-means for moving said secondary centralizing-member into engagement with the device.

3.1n a self-centering arbor adapted to support a device having a trusto-conical opening, the combination of: an arbor; a primary centraliZing-member on said arbor, adapted to rest in the trusto-conical opening; primary-means for engaging and moving the device relative to said primary centralizing-member to cause the Wall ot the frusto-conical opening to engage said primary centralizing-member; a secondary centralizing-niember on said arborgaiid secondarymeans for moving said secondary centralizing-member into engagement with thedevice. .11. 1n a self-centering arbor adapted to support a device having a frusto-conical 70 opening, the combination of; an arbor; a primary centraliZing-member on said arbor, adapted to rest inV the :trusto-conical Opening; primary-means tor'engaging and moving the device relative to said primary cen-,375 ltralizing-m'ember to cause the Wall of" the Jrusto-c-onical opening to engage said primary centraiiZing-inember; a secondaryV centraliZing-member on said arbor, Vhaving a truste-conical tace adapted to engage the cle-:.30 vice at one end ot the rusto-conical opening, and secondary-means for moving vsaid 'secondary centraliZing-member into engagement with the device.

5. in a self-centering arbor adapted to85 support a device having a rusto-conical opening, the combinati-on of: an arbor; a primary centraliZing-member on said arbor, adapted to rest in the truste-conical opening; primary-means for engaging and moving the-.90 device relative to said primary centralizingmember to cause the Wall of the rusto-conical opening to engage said primary centralizing member; a secondary centralizingmember on said arbor; and secondary-means in the form oi a nut threaded on said arbor i'or moving said secondary centralizingmember into engagement with the device.

6. in a self-centering arbor adapted to snpport a device having a Jr'rusto-conical open-y 100 ing, the combination ot: an arbor; a primary centralizing-member on said arbor, adapted to rest in the truste-conical opening; primary-means tor engaging and moving the device relative'to said primary centralizing" 105 member to canse the Wall of the rustro-conical opening to engage said primary centralicing-member; a sec-ondary centralizingmember on said arbor, having a rnstro-conical face adapted to engage the device at ondy end or the truste-conical opening; and secondary-means in the form of a nnt threaded on said arbor for moving said secondary centraliZing-member into'engagement With the,V device. v

7. in a self-centering 'arbor adapted to support a device having a irusto-conical opening, the combination of: an arbor; a primary centraliZing-member on said arbor, adapted to,V rest in the trusto-conical opening; primary-12.0 means in the form et a. nut threaded on said arbor for engaging and moving the device relative to said primary centralizing-member to cause the Wall of the frusto-conical open-7125,

ing to engage said primary centraliZing-member; a secondary centralizing member on said arbor; and secondary-means for moving said secondary centraliZing-member into en gagement with the device.

` in the form of a nut threaded on said arbor f 8. In a self-centering arbor adapted to support a device having a frusto-conical opening, the combination of: an arbor; a primary centralizing-member -on said arbor1 adapted to rest in the frusto-conical opening; primary-means in the form of a nut threaded on said arbor for engaging and moving the device relative to said primary centralizingmember to cause the Wall of the frustro-conical opening to engage said primary centraliZing-member; a secondary centralizingmember on said arbor; and secondary-means `for moving said secondary centraliZing-member into engagement with the device.

In testimony whereof7 l have hereunto setY my Vhand at Los Angeles, California, this 30th day of October, 1928.

HAROLD W. LANGBEIN. 

